§  75.32 Determination of monitor data availability for standard missing data procedures.

(a) Following initial certification (i.e., the date and time at which quality assured data begins to be recorded by the CEMS), upon completion of: the first 720 quality-assured monitor operating hours of an SO2 pollutant concentration monitor, or a CO2 pollutant concentration monitor (or O2 monitor used to determine CO2 concentration), or an O2 or CO2 diluent monitor used to calculate heat input or a moisture monitoring system; or the first 2,160 quality-assured monitor operating hours of a flow monitor or a NOX-diluent monitoring system or a NOX concentration monitoring system, the owner or operator shall calculate and record, by means of the automated data acquisition and handling system, the percent monitor data availability for the SO2 pollutant concentration monitor, the CO2 pollutant concentration monitor, the O2 or CO2 diluent monitor used to calculate heat input, the moisture monitoring system, the flow monitor, the NOX-diluent monitoring system and the NOX concentration monitoring system as follows:

(1) Prior to completion of 8,760 unit operating hours following initial certification, the owner or operator shall, for the purpose of applying the standard missing data procedures of §  75.33, use equation 8 to calculate, hourly, percent monitor data availability. $$

(2) Upon completion of 8,760 unit operating hours following initial certification (or, for a unit with less than 8,760 unit operating hours three years (26,280 clock hours) after initial certification, upon completion of three years (26,280 clock hours) following initial certification) and thereafter, the owner or operator shall, for the purpose of applying the standard missing data procedures of §  75.33, use equation 9 to calculate, hourly, percent monitor data availability. $$

(3) The owner or operator shall include all unit operating hours, and all monitor operating hours for which quality-assured data were recorded by a certified primary monitor; a certified redundant or non-redundant backup monitor or a reference method for that unit; or by an approved alternative monitoring system under subpart E of this part when calculating percent monitor data availability using equation 8 or 9. No hours from more than three years (26,280 clock hours) earlier shall be used in equation 9. For a unit that has accumulated less than 8.760 unit operating hours in the previous three years (26,280 clock hours), replace the words "during previous 8,760 unit operating hours" in Equation 9 with "in the previous three years" and replace "8,760" with "total unit operating hours in the previous three years". The owner or operator of a unit with an SO2 monitoring system shall, when SO2 emissions are determined in accordance with §  75.11(e)(1) or (e)(2), exclude hours in which a unit combusts only gaseous fuel from calculations of percent monitor data availability for SO2 pollutant concentration monitors, as provided in §  75.30(d).

(b) The monitor data availability need not be calculated during the missing data period. The owner or operator shall record the percent monitor data availability for the last hour of each missing data period as the monitor availability used to implement the missing data substitution procedures.

[58 FR 3701, Jan. 11, 1993, as amended at 60 FR 26529, 26567, May 17, 1995; 61 FR 59160, Nov. 20, 1996; 64 FR 28602, May 26, 1999]